[EN] Efficient schemes for warning message dissemination in vehicular ad hoc networks (VANETs) use context information collected by vehicles about their neighbor nodes to guide the dissemination process. These schemes maximize their performance when all the vehicles advertise correct information about their positions, and hence position errors may drastically reduce the performance of the dissemination process. We present a proactive Cooperative Neighbor Position and Verification (CNPV) protocol that detects nodes advertising false locations so as to mitigate the impact of adversarial users. We combine our mechanism with two warning dissemination schemes for VANETs, and demonstrate how these algorithms can benefit from the use of our security scheme in the presence of malicious nodes trying to exploit the inherent vulnerabilities of each algorithm.[-]

This work was partially supported by the Ministerio de Ciencia e Innovacion´ , Spain, under Grant TIN2011-27543-C03-01, by the Fundaci´on Universitaria Antonio Gargallo and the Obra Social de Ibercaja, under Grant 2013/B010, ...[+]

This work was partially supported by the Ministerio de Ciencia e Innovacion´ , Spain, under Grant TIN2011-27543-C03-01, by the Fundaci´on Universitaria Antonio Gargallo and the Obra Social de Ibercaja, under Grant 2013/B010, as well as by the Diputacion General de Arag ´ on´ and the European Social Fund (T91 Research Group).[-]